Stop comparing yourself with others. Try to understand that some have it better than you, but many have it much worse. When we make ourselves miserable by comparing ourselves with others, we are wasting time and energy that we could use in building our own inner resources. Compliment yourself every morning. Being happy makes you a more positive person, which helps you put those positive vibes out into the world.
You have your own unique gifts and talents. Focus on sharing them with the world instead of focusing on the gifts of another.